header {
    height: 70px;
    border-bottom: solid 5px #41a8a5;
    box-shadow: rgba(0, 0, 0, 0.9) 0 0 10px;
    .container {
        width: 1100px;
        margin: 0 auto;
        font-size: 16px;
        padding-top: 25px;
        .logo {
            float: left;
            a {
                color: #0098af;
                font-size: 20px;
                font-weight: bold;
                margin-right: 10px;
                text-decoration: none;
            }
        }
        nav {
            float: left;
            a {
                text-decoration: none;
                font-size: 18px;
                color: #7c7c8c;
                margin-right: 10px;
            }
        }
        .message {
            float: left;
            margin-left: 5px;
        }
        .user {
            float: left;
            margin-left: 10px;
            position: relative;
            &:hover {
                cursor: pointer;
                .user-menu {
                    display: block;
                }
            }
            .user-menu {
                position: absolute;
                width:80px;
                border: solid 1px #ececec;
                background-color: white;
                top: 26px;
                display: none;
                a {
                    text-decoration: none;
                    display: block;
                    margin-top: 10px;
                    color: #999;
                    text-align: center;
                    font-size: 16px;
                }
            }
        }
    }
}
